An exercise ball is a ball constructed of soft elastic with a diameter of approximately 65 centimeters (26 inches) and filled with air. The air pressure is changed by removing a valve stem and either filling with air or letting the ball deflate. It is most often used in physical therapy,athletic training and exercise.

It can also be used for weight training. The ball, while often referred to as a Swiss ball, is also known by a number of different names, including balance ball, birth ball, body ball, ball, fitness ball, gym ball, gymnastic ball, physioball, pilates ball, Pezzi ball, sports ball, stability ball, Swedish ball, therapy ball, or yoga ball.

A primary benefit of exercising with an exercise ball as opposed to exercising directly on a hard flat surface is that the body responds to the instability of the ball to remain balanced, engaging many more muscles.

Those muscles become stronger over time to keep balance. Most frequently, the core body muscles ache the abdominal muscles and back muscles ache are the focus of exercise ball fitness programs.

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